The sentence hearing for convicted paedophile Robert Hughes has been told distressing details of how his crimes affected his victims' lives.

The Hey Dad! star was last month convicted of 10 child sexual offences dating back to the 1980s.

In front of a packed Sydney courtroom, the father of Hughes' youngest victim read his daughter's words.

Her victim impact statement explained how the assaults, which occurred during a sleepover at the Hughes' household when she was as young as six, have taken an "immeasurable" toll on her life.

"I have never truly felt safe ever again... I never wanted Santa to come into my room to bring presents," her statement read.

Hughes, who has been incarcerated since early April, looked drawn as he listened to three more victim impact statements read by police officers.

In one, a woman explained how she has suffered years of eating disorders and feelings of worthlessness since being assaulted at Manly Beach when she was nine years old.

She said she wears baggy clothes so no-one will notice her.

"I never thought I'd see this day. For 26 years I've tried to deal with the fact that this just happened," she said.

I will never have children because of Robert. I never want to risk having a kid going through what I did.

Sexual assault victim of Robert Hughes

"Maybe now I can try to piece my life together again, to not feel ashamed or dirty.

"Throughout the years when I heard your voice on a TV commercial or the first few bars of the Hey Dad! theme I turned the TV down and walked out of the room.

"I hope the punishment fits the crime and you will have to suffer for years to come, just like I have... I wish you nothing but misery."

Another victim said she has come to hate the word "dad".

"I will never have children because of Robert. I never want to risk having a kid going through what I did," she said.

A fourth victim, who was sexually assaulted in her own home, wrote: "I used to think I was a nervous teenager... not being able to breathe was very normal to me... not feeling safe at someone's house," she said.

"I have learnt my feelings are normal for someone who has been abused, not for someone who has not."

Crown prosecutor Gina O'Rouke has asked the judge presiding over the sentencing to take into account the young age of the victims.

"When one looks at the particulars [of the crimes] the Crown would submit that it's very serious," she said.

District Court Judge Peter Zahra explained he has been asked "to apply what we did 30 years ago when these offences occurred".

However, he noted the long-term effects of sexual assaults of young children were not as well understood in the 1980s and penalties for the same crimes are heavier today.